Building outdoors in the winter months with low temperatures and precipitation can cause major delays and various safety risks. It is therefore important to, among other things, ensure adequate lighting and covering (for example on scaffolding), avoid cold storage of materials and ensure good traffic conditions.
You can read more about various winter measures at the Danish Branch Work Environment Council here:
http://www.bar-ba.dk/planlaegning/indretning-af-byggepladsen/vinterforanstaltninger
